Shuttle



my 12, 1936. L PAWA v041515570 SHUTTLE Filed om. 9, 1935 Egmunmlllll I M Hllllllllllllluumnmm I WTA/5556 55 559 'NVENTOR LL@ 1; Pcww,

. ATTORNEYS Patented May 12, 1936 UNITED STATES PATENT OFFICE 6 Claims.

This invention relates to shuttles and has for an object of invention a construction Where not only the usual appearance of a shuttle is presented but wherein the mechanism has been improved to utilize in the tension mechanism a metallic spring.

Another object of the invention is to provide in a shuttle a tension device, including a comparatively stiff swinging arm and a metallic spring for acting on the arm to normally maintain the same in a given position and to move the same back to said given position when moving therefrom.

A further object of the invention is to provide in a shuttle a tension device including a swinging arm With a flat spring acting thereon to hold .the same in a given position, and means for adjusting the effective action of said spring.

In the accompanying drawing- Figure 1 is a plan View of a shuttle disclosing an embodiment of the invention;

Figure 2 is an enlarged sectional view through Figure 3 approximately on line 2 2;

Figure 3 is an edge view of the righthand end portion of Figure 1, the same being on an enlarged scale;

Figure 4 is a fragmentary sectional view through Figure 2 on line 1 -4;

Figure 5 is an enlarged detailed perspective view of the tension spring and associated parts;

Figure 6 is a longitudinal vertical sectional view through a modied form of tension spring and associated parts.

Referring to the accompanying drawing by numeral, I indicates the body of the shuttle which is of the usual shape now in common use and in which is mounted the usual spindle 2 on which the yarn 3 is positioned. The yarn is fed from the spindle 2 to the end portion 4 of shuttle I. Heretofore, various tension devices have been provided which apply a proper tension on the yarn in a more or less satisfactory manner, but in the invention set forth herewith an improved tension structure is presented wherein all of the parts are metal and formed to withstand long usage.

As seen particularly in Figure 2, the tension device 5 is provided with what may be called a rigid tension arm 6, a tension spring 'I carried by the casing 8, and a number of tension pins 9 associated with arm 6, as well as the guiding and tension pins II! and II. Pin II) acts to guide the yarn in one direction while pin II guides the yarn in an opposite direction. It will be noted from Figure 2 that all the pins but II are arranged in line and that the yarn 3 passes over what may be termed the outside face of the pins, said yarn being looped through the various eyes I2, I3, I4, and I5 forming part of arm 6'. Arm 6 may be made of any desired material in various ways, but it has been found convenient to use a comparatively heavy wire bent to form the eyes I2 to I 4 and also to form a tubular section I6 which loosely rests on the pivotal pin I'I. From the tubular section I6, the material presents an extension I8 which is provided with a slight cifset I9 and from this offset extends a bent back bar 20 so that the members I9 and 20 form in al certain sense an eye into which the downwardly curved end 2I of the tension spring 'I projects. The arm 6 is preferably made from metal but it could be made from any other rigid material and by reason of the coils of the tubular portion I6 the parts may be slightly resilient, but this resiliency is negligible and as far as the invention is concerned arm 6 is rigid throughout, but pivotally mounted on pin I'I. When the parts are in use yarn 3 is threaded as shown in Figure 2 and when there is a pull on the yarn the arm 6 will swing downwardly or toward pin I I. This movement is against the action of the tension spring 'I. It will be understood that the curved end 2| of spring 1 merely presses against the portion I9 and slides thereon as the parts operate. Spring 'I is a flat metallic spring and extends from the offset I9 to the left as shown in Figure 2, so that the end may be bent down at 22 so as to extend through an aperture 23 in casing 5. This casing is formed from a piece of flat sheet metal bent to provide a bottom section 24 (Figure 5) which is curled over to provide v overhanging shoulders 25 and 26 and a curled end 21 which acts as a hinge knuckle through which the pin or retaining screw 28 extends. A clamping plate or abutment 29 is provided, the same having a pin 3U and knob 3| extending from the central portion thereof. Plate 29 is substantially arc-shaped as shown in Figure 2, and is somewhat resilient so that it may be freely slid either to the right or left as shown in Figure 2. If it is moved to the right as shownin Figure A2, the spring I will swing from the extreme forward end 32 of the plate or abutment 29 and consequently will be much stronger or stiffer so as to take care of stronger yarns. Where the yarn is comparatively weak and less tension is necessary, knob 3| is grasped and the plate or abutment 29 is forced to the left as shown in Figure 3 as far as possible. This will move the pinching or clamping end 32 as far as possible away from arm 6 whereupon the effective length of spring 1 will be greatly increased. This will allow a greater action by the spring and consequently a yarn of less strength may swing the arm 6 appreciably. By s'liding the plate or abutment 29 back and forth various tensions may be secured so as to adapt the device to any kind of yarn that might be used. After the yarn passes through the eye 33 it moves through a tortuous passageway as shown in Figure 2, and friction of the parts produces a `desired tension. If the arm 6 should be s'wung downwardly until the eyes l2 to l5 were almost in line with the pins 9 the tortuous path would be slight and consequently the tension would be slight, but by reason of the action of spring 1 these eyes are held away somewhat from the pins and consequently the desired friction is secured whereby a desired tension is maintained. All of the parts of the tension device will wear for a comparatively long time and if it should become worn out new parts could be readily substituted, but ordinarily the tension device will wear as long as the main part of the shuttle.

As illustrated particularly in Figure 5 the abutment 29 is provided with upstanding stops 33 and 34 adapted to fit into the pair of notches 35 'formed in members 25 and 26. This arrangement is provided so that abutment may be locked in any desired adjusted position. It will be noted that the abutment 29 is spaced resiliently so that it may be forced downwardly until the members 33 and 34 maybe slid from one notch V35 to the other; also, in order to keep the spring 'l properly centrally positioned the b'c'ittornA V24 is provided with a small groove or recess 36 sufficiently deep to Yaccommodate the spring` so the upper surface of the spring is even with the upper surface of bottom 24 or slightly above the same whereby the ends of the abutment 29 mayY firmly clamp the same at all times.

Referring to Figure 6, 31 indicates a casing similar to the casing 8 shown in Figure 5 except that the curled extension 21 is at the opposite end thereof, though it could be at'the same end if desired. In this form of the invention, the spring 1 is preferably provided with a bowed up portion 1"; also in this formof invention, instead of having member 29 there is provided a clamping plate 38 formed of spring metalwhich has been bent at 39 to form a spring't'op 40 having an additional bent portion presenting up. standing head 4| which may project into any pair of notches 42. In this form of the invention the member 4| is merely depressed and then moved in one direction or the other alo-ng casing Y31.

I claim:V

1. A tension device for shuttles comprising a pivotally mounted tension arm, a flat spring" having one nd pressing against one end of said arm, a casing supporting part of said spring, and a sliding member reacting( on said casing for pinching said spring at different points along the length thereof so as to vary its effective length in regard to 4s'aid ar'in. Y

2. A yarn tension device for shuttles including an arm pivotally mounted intermediate its length, a iiat spring positioned so that one end thereof will engage one end of said arm, a casing for the spring rigidly secured in place and means slidable along the spring and pressing the spring against the casing so as to vary the effective length of the spring.

3. A shuttle including a body having a cutaway portion, a tension device arranged at the cut-away portion, said tension device including a plurality of pins, an arm pivotally mounted intermediate its length and provided with eyes coacting with said pins to form a tortuous passage- Way for said yarn, a flat spring having one end engaging one end of said ,arm for holding the arm normally in a givenposition, a casing rigidly secured to said body for supporting said spring and a sliding clamp carried by said casing, said clamp sliding longitudinally of the spring and acting to press the spring against the casing so that the effective length of the spring may be varied by moving the clamp toward or from the end of the spring engaging said arm,

4. A yarn tension device for shuttles, including a swinging arm, a at metal spring having one end pressing against one end of said arm, a clamp slidably mounted on said spring and adapted to clamp the spring at different points for varying the effective length of said spring, a notched casing into which said spring projects and means carried by said clamp adapted to be moved into the respective notches in said casing for looking the clamp against accidental shifting.

5. A yarn tension device for shuttles including a swinging arm, a flat metal spring having one end pressing against one end of said arm, and

means for varying the tension of said spring,l

said means including a casing into which part of said spring extends said casing having a plurality of notches and a resilient clamp having a flat portion pressing against said spring and upwardly extending portion provided with a bead adapted to be tted into one of said notches for locking the plate against accidental movement.

6. A shuttle comprising a body having a tension device vformed with a swinging member provided with a plurality of eyes through which yarn is adapted to extend, means for pivotally mounting said member intermediate its ends, a casing secured to said body, said casing having a pair of upstanding flanges, each of said flanges having a plurality of notches, a. flat spring having one end anchored in said casing and the other end resting on one end of said swinging member, .a clamp carried by said casing between said flanges, said clamp being slidable along said spring for varying the effective length thereof, and a locking member for locking said clamp at different points along said spring, said locking member when in functioning position resting on said clamp and extending into one notch in each of said flanges, said locking member being movable from one notch to another as said clamp is adjusted along said spring.

LUIGI PAVIA. 

